Re: [PATCH v2 0/3] rte_ether_unformat_addr changes

[Stephen Hemminger <stephen@networkplumber.org>]

On Tue, 3 Oct 2023 11:44:16 +0100
Ferruh Yigit <ferruh.yigit@amd.com> wrote:

> On 10/2/2023 7:37 PM, Stephen Hemminger wrote:
> > This patchset makes rte_ether_unformat_addr allow other formats
> > for MAC address. Need to remove some inputs from existing
> > cmdline_etheraddr test, and add a new test in test suite
> > to cover this.  There is some overlap between the two tests
> > but that is fine.
> > 
> > Stephen Hemminger (3):
> >   test: remove some strings from cmdline_etheraddr tests
> >   rte_ether_unformat: accept more inputs
> >   test: add tests for rte_ether routines
> >   
> 
> Thanks Stephen,
> 
> This enables using the API as replacement to the tap PMD's local parse
> implementation:
> https://patchwork.dpdk.org/project/dpdk/patch/20230323170145.129901-1-drc@linux.vnet.ibm.com/


It can be simplified to just this.
No need to check value == NULL, already checkd.
No need to check for user_mac == NULL, since only called one place and that place
passes pointer to stack variable.


From b478a17f13a1bedadca3b60608c585f31c9ad8f2 Mon Sep 17 00:00:00 2001
From: David Christensen <drc@linux.vnet.ibm.com>
Date: Thu, 23 Mar 2023 13:01:45 -0400
Subject: [PATCH] net/tap: resolve stringop-overflow with gcc 12 on ppc64le

Building DPDK with gcc 12 on a ppc64le system generates a
stringop-overflow warning. Replace the local MAC address
validation function parse_user_mac() with a call to
rte_ether_unformat_addr() instead.

Bugzilla ID: 1197
Cc: stable@dpdk.org

Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
---
 drivers/net/tap/rte_eth_tap.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index bf98f7555990..b25a52655fa2 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -2267,29 +2267,6 @@ set_remote_iface(const char *key __rte_unused,
 	return 0;
 }
 
-static int parse_user_mac(struct rte_ether_addr *user_mac,
-		const char *value)
-{
-	unsigned int index = 0;
-	char mac_temp[strlen(ETH_TAP_USR_MAC_FMT) + 1], *mac_byte = NULL;
-
-	if (user_mac == NULL || value == NULL)
-		return 0;
-
-	strlcpy(mac_temp, value, sizeof(mac_temp));
-	mac_byte = strtok(mac_temp, ":");
-
-	while ((mac_byte != NULL) &&
-			(strlen(mac_byte) <= 2) &&
-			(strlen(mac_byte) == strspn(mac_byte,
-					ETH_TAP_CMP_MAC_FMT))) {
-		user_mac->addr_bytes[index++] = strtoul(mac_byte, NULL, 16);
-		mac_byte = strtok(NULL, ":");
-	}
-
-	return index;
-}
-
 static int
 set_mac_type(const char *key __rte_unused,
 	     const char *value,
@@ -2311,7 +2288,7 @@ set_mac_type(const char *key __rte_unused,
 		goto success;
 	}
 
-	if (parse_user_mac(user_mac, value) != 6)
+	if (rte_ether_unformat_addr(value, user_mac) < 0)
 		goto error;
 success:
 	TAP_LOG(DEBUG, "TAP user MAC param (%s)", value);
-- 
2.39.2